2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
8 * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
11 #define pr_fmt(fmt) "bcm63xx_nvram: " fmt
13 #include <linux/init.h>
14 #include <linux/crc32.h>
15 #include <linux/export.h>
16 #include <linux/kernel.h>
17 #include <linux/if_ether.h>
19 #include <bcm63xx_nvram.h>
24 struct bcm963xx_nvram {
31 u8 mac_addr_base[ETH_ALEN];
38 static struct bcm963xx_nvram nvram;
39 static int mac_addr_used;
41 void __init bcm63xx_nvram_init(void *addr)
43 unsigned int check_len;
44 u32 crc, expected_crc;
45 u8 hcs_mac_addr[ETH_ALEN] = { 0x00, 0x10, 0x18, 0xff, 0xff, 0xff };
47 /* extract nvram data */
48 memcpy(&nvram, addr, sizeof(nvram));
50 /* check checksum before using data */
51 if (nvram.version <= 4) {
52 check_len = offsetof(struct bcm963xx_nvram, reserved3);
53 expected_crc = nvram.checksum_old;
54 nvram.checksum_old = 0;
56 check_len = sizeof(nvram);
57 expected_crc = nvram.checksum_high;
58 nvram.checksum_high = 0;
61 crc = crc32_le(~0, (u8 *)&nvram, check_len);
63 if (crc != expected_crc)
64 pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
67 /* Cable modems have a different NVRAM which is embedded in the eCos
68 * firmware and not easily extractible, give at least a MAC address
71 if (BCMCPU_IS_3368()) {
72 memcpy(nvram.mac_addr_base, hcs_mac_addr, ETH_ALEN);
73 nvram.mac_addr_count = 2;
77 u8 *bcm63xx_nvram_get_name(void)
81 EXPORT_SYMBOL(bcm63xx_nvram_get_name);
83 int bcm63xx_nvram_get_mac_address(u8 *mac)
88 if (mac_addr_used >= nvram.mac_addr_count) {
89 pr_err("not enough mac addresses\n");
93 memcpy(mac, nvram.mac_addr_base, ETH_ALEN);
94 oui = mac + ETH_ALEN/2 - 1;
95 count = mac_addr_used;
98 u8 *p = mac + ETH_ALEN - 1;
108 pr_err("unable to fetch mac address\n");
116 EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address);